Steam-turbine.



S. MARQUIS. STEAM TURBINE. APPLICATION FILED AUG. 15, 1914.

- Patented June 13, 1916.

FTC

SYDNEY MARQUIS, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALL-IS-CHALMERS MANUFACTURING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

STEAM-TURBINE.

Specification of Letters Eatent.

Patented June 13, 1916.

Original application filed February 9, 1914, Serial No. 818,154. Divided and this application filed August 15, 1914. Serial No. 856,983.

To all whom it may concern Be it known that I, SYDNEY MAR UIS, a citizen of the United States, residing at V est Allis, Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented a certain new and useful Improvement'in SteamTurbines, of which the following is a specification.

This invention relates to steam turbines and more particularly to means for securing the shroud to the blade ends and for properly positioning the blades at one end.

An object of the invention is to provide an assembled blade structure for steam turbines which is simple in construction, efficient in operation, and which possesses the requisite amount of rigidity and strength,

especially to withstand vibration.

One of the more specific objects of the invention is to provide efficient means for securing a comparatively light shroud to the ends of a plurality of blades by fusion of metal, this shroud being imperforate and being provided with means in the form of a recessed projection, for properly positioning the blade ends.

Another object is to provide a shroud having side projections which coact with edge portions of the blades in order to properly aline the blade ends in a direction transversely of the row of blades.

This application is a division of application Serial No. 818,154, filed Feb. 9, 191d, claiming a process of manufacturing the article claimed herein.

Heretofore it had been proposed to fasten a shroud to the ends of blades by fusion of metal, for instance by brazing, the blade ends having been properly positioned by forming a tenon on the blade and inserting the same in a hole formed in the shroud. The objections to this construction are, first, that considerable of the blade stock is wasted in forming the tenon; second, that the shroud is weakened at least temporarily, by forming the holes therein for the tenons. With the use of the present invention these objections are eliminated.

A clear conception of an embodiment of the invention may be had by referring to erence characters designate the same or similar parts in the various views.

Figure 1 is an elevation of a fragment of a shroud attached to a plurality of blade fragments. Fig. 2 is a transverse section through the blades, the section being taken along the line IIII of Fig. 1 looking in the direction of the arrows. Fig. 3 1s a transverse vertical section through a shroud attached to a fragment of a blade and showing a fragment of the stationary easing, the section being taken along the line III-III of Fig. 2. Fig. 4 is a transverse vertical section through a shroud attached to a fragment of a blade and showing a fragment of the stationary casing, the section being taken along the line IVIV of Fig. 2.

lVhile the figures of the drawing disclose rotor or movable blading of a turbine of the parallel flow type, it is to be understood that the invention is equally applicable to stator or stationary blading as well as to other types of turbines. The shroud 2, which is preferably made as light as possible, is provided on its blade side with a pair of side projections l and an intermediate projection 7,.these projections prior to being notched for insertion of the blade ends being continuous throughout the length of the shroud steel-z. The intermediate projection 7 is considerably larger than the side projections 4.

In order to permit proper positioning of the blade ends, the projectionse, 7 of the shroud 2, are recessed by removal of the metal to form the recesses 8. This removal. of the metal is accomplished by the use of a saw, breach, milling cutter or other suitable means, which may be operated rectilinearly across the entire inner face of the shroud 2, thereby simultaneously forming alined recesses 8 in all of the projec tions 4, 7.

After the side projections 4 and the in termediate projection 7 of the shroud 2 have been properly recessed, the shroud 2 is applied to the ends of the blades 1 which have been previously fixed in a suitable founda tion segment in the usual manner. In order to permit insertion of the ends of the blades 1 within the recesses 8 formed in the projection 7, the edge portions of the blade I ends are slightly notched, see Fig. 4, these positioning the blades 1, the production of these recesses merely facilitating the op eration of recessing the intermediate projection 7 The portions of the side projections twhich remain after the recesses 8 have been cut, serve to properly aline the blade ends in a direction transversely to the row of blades 1. The recesses 8 formed in the intermediate projection 7 serve to properly space and angle the blade ends, the angling and spacing of the blade ends being determined by the direction and location of the recesses '8 in the projection 7. This mode of reoessing a projection on a shroud is contra-distinguished from the mode of forming a shroud with a series of individual pro-- jections with recesses left between them, although the original projection is in fact altered to form divisional projections after recessing. The present mode of recessing a projection insures that the recess will coact with the working faces of the blades longitudinally to a maximum extent.

It will be noted that by the use of the form of shroud 2 as disclosed, the blade ends can be united by fusion of metal directly to the surface of theshroud 2 adjacent these ends without necessitating waste of blade stock such as results from forming spacing and angling tenons on the blades 1. The combination of an imperforate shroud having a recessed projection with a plurality of blades united thereto by fusion of metal results in a structure having great rigidity and strength.

It should be understood that it is not desired to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. In combination, a blade, and a shroud having a recessed projection for positioning said blade, said shroud being secured to said blade at said recess.

2. Incombination, a blade, and a shroud having a recessedprojection for positioning said blade, said shroud being secured to said blade at said recess by fusion of metal.

3. In combination, a blade, and an imperforate shroud having a recessed projection for positioning said blade, said shroud being secured to said blade at said recess.

4.. In combination, a blade, and an imperforate shroud having a recessed projection.

for positioning said blade, said shroud being secured to said blade at saidrecess by fusion of metal.

5. In combination, a plurality of blades, and a shroud having a projection recessed at equally spaced points for positioning said blades, said shroud being secured to said blades at said recesses.

6. In combination, a plurality of blades, and a shroud having a projection recessed at equally spaced points for positioning said blades, said shroud being secured to said blades at said recesses by fusion of metal.

' 7. In combination, a plurality of blades, and an imperforate shroud having a proj ection recessed at equally spaced points for positioning said blades, said shroud being secured to said blades at said recesses.

diate projection forpositioning said blade, .said side projections coacting with edge portions of said blade and said intermediate oro'ection coactin with an intermediate portion of said blade.

10. In combination, a plurality of blades, and ashroud secured to the extreme ends of said blades by fusion of metal, said shroud having projections spanning the spaces between successive blades and said projections coacting with working faces only of said blades. v

11. Incombination, a plurality of blades, and a shroud secured to the extreme ends of said blades 'by fusion of metal, said shroud having a series of alined projections spanning the spaces between succes-V sive blades and said projections coacting with working faces of said blades.

In testimony whereof, the signature of the inventor is affixed hereto in the presence of two witnesses.

SYDNEY MARQUIS. l/Vitnesses: a 7

JOHN L. ARNOLD, W. H. LIEBER.

7 copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. 0. v 

